www.digitalmars.com         C & C++   DMDScript  

digitalmars.D.announce - segfault when printing 2 dimentional array

reply "Ameer Armaly" <ameer_armaly hotmail.com> writes:
Hi all.
The following code makes the compiler segfault:
import std.stdio, std.string;
void main()
{
writefln(split("A b"));
}
-- 
---
Life is either tragedy or comedy.
 Usually it's your choice. You can whine or you can laugh.
--Animorphs
Jul 22 2005
next sibling parent reply Derek Parnell <derek psych.ward> writes:
On Fri, 22 Jul 2005 17:52:14 -0400, Ameer Armaly wrote:


 Hi all.
 The following code makes the compiler segfault:
 import std.stdio, std.string;
 void main()
 {
 writefln(split("A b"));
 }


The split() function returns a set of slices into its parameter. If you are
running on Linux, the string literal is in protected RAM so writes to it
will fail. 

When I run your test on Windows, I just get a bad format code message.

Here is my version of your test to make it work ...


import std.stdio, std.string;
void main()
{
    foreach(char[] s; split("A b".dup))
        writefln(s);
}


-- 
Derek Parnell
Melbourne, Australia
23/07/2005 8:59:00 PM
Jul 23 2005
parent Stewart Gordon <smjg_1998 yahoo.com> writes:
Derek Parnell wrote:

 On Fri, 22 Jul 2005 17:52:14 -0400, Ameer Armaly wrote:
 

 Hi all.
 The following code makes the compiler segfault:
 import std.stdio, std.string;
 void main()
 {
 writefln(split("A b"));
 }


 
 The split() function returns a set of slices into its parameter. If you are
 running on Linux, the string literal is in protected RAM so writes to it
 will fail. 


<snip>

Why would this code cause a write to the string literal?

Stewart.

-- 
-----BEGIN GEEK CODE BLOCK-----
Version: 3.1
GCS/M d- s:- a->--- UB  P+ L E  W++  N+++ o K- w++  O? M V? PS- PE- Y? 
PGP- t- 5? X? R b DI? D G e++>++++ h-- r-- !y
------END GEEK CODE BLOCK------

My e-mail is valid but not my primary mailbox.  Please keep replies on 
the 'group where everyone may benefit.
Jul 25 2005
prev sibling parent reply "Ben Hinkle" <ben.hinkle gmail.com> writes:
"Ameer Armaly" <ameer_armaly hotmail.com> wrote in message 
news:dbrprs$1pb6$1 digitaldaemon.com...

 Hi all.
 The following code makes the compiler segfault:
 import std.stdio, std.string;
 void main()
 {
 writefln(split("A b"));
 }


I think you wanted to post this to D.bugs and not D.announce.
On Windows the compiler didn't seg-v (since you say seg-v I assume you're on 
Linux, though) but it does give a FormatError when you run the program. 
That's because general dynamic arrays are not handled by 
std.format.doFormat. I've fixed up doFormat to write the string 
[s_1,s_2,...,s_N] where s_k is the result of calling doFormat recursively on 
the kth element of the array. Right now I have it working for dynamic 
arrays. I'll try to get static and associative arrays going and send the 
result to Walter.
Jul 23 2005
parent Dave <Dave_member pathlink.com> writes:
In article <dbteao$6oa$1 digitaldaemon.com>, Ben Hinkle says...

"Ameer Armaly" <ameer_armaly hotmail.com> wrote in message 
news:dbrprs$1pb6$1 digitaldaemon.com...

 Hi all.
 The following code makes the compiler segfault:
 import std.stdio, std.string;
 void main()
 {
 writefln(split("A b"));
 }


I think you wanted to post this to D.bugs and not D.announce.
On Windows the compiler didn't seg-v (since you say seg-v I assume you're on 
Linux, though) but it does give a FormatError when you run the program. 
That's because general dynamic arrays are not handled by 
std.format.doFormat. I've fixed up doFormat to write the string 
[s_1,s_2,...,s_N] where s_k is the result of calling doFormat recursively on 
the kth element of the array. Right now I have it working for dynamic 
arrays. I'll try to get static and associative arrays going and send the 
result to Walter. 


With DMD v0.128, this code doesn't segfault on either Windows or Linux during
compilation and 'Error: std.format formatArg' is the result when it is run on
either.

- Dave
Jul 23 2005